铁路大跨度提篮式系杆拱桥全桥模型试验

A Model Test on Long-span X-style Tied Arch Bridge on Railway

九曲河大桥是大跨度尼尔森体系钢管混凝土提篮式系杆拱桥设计方案,为了检验结构在施工及运营阶段能否满足高速铁路桥梁的功能要求,进行了该桥的全桥模型试验研究。简单介绍了模型的设计原则、相似关系和技术要点,对模型的加载方法、配重大小、测试截面设置等也进行了讨论。重点是通过对试验结果的分析以及与理论计算的比较,全面研究了结构在多种工况下的结构行为。研究表明,尼尔森体系具有受力匀称、承载能力大的特点;试验研究也验证了计算理论的正确性,同时表明该桥具有足够的横向刚度,具有较大的承受超载和偏载的能力。

Jiuquhe bridge is a Nielsen system xstyle concretefilled steel tubular tied arch bridge. To verify whether it can accord with the demands of highspeed railway, a model test on this bridge was conducted by the authors. The design principle, the ratio of similarity and the key techniques of the model are introduced in the paper. The loading method, the value of the supplementary weight and the arrangement of the test sections are also discussed. The paper focuses on the structural behavior of this type of structure that is thoroughly studied by analyzing the results of the model test and comparing them with the theoretical ones. The research shows that Nielson system has the advantages in distribution of forces and capacity of resisting loading. It is proved that the theory used in the design is correct, the lateral stiffness is large enough and the capacity of resisting overload and eccentric loading is good. The results of the paper can be an important reference for design and the construction of concretefilled steel tubular tied arch bridges.